Power Loading in Peak Limited Intensity Modulation Direct Detection Mode Group Division Multiplexing

Nir Sheffi, Dan Sadot

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


The exponential growth of network traffic within data centers and high-performance computing generates a growing volume of fiber cabling. This raises the need for spectrally efficient communication scheme, which allows easy integration of optics and electronics. In this paper, we suggest a mode group division multiplexing scheme based upon intensity-modulated silicon photonics (SiP) Mach-Zehnder modulators (MZMs) coupled to standard graded-index multi-mode fiber directly detected using multi-segment concentric photo-detector. In addition, we have theoretically derived the bit and power loading of such a system in a closed-loop multiple-input multiple-output (MIMO) formation using convex optimization with two possible types of architectures: the vertical Bell Labs layered space-time architecture (V-BLAST) with minimum mean square error and successive interference cancellation (MMSE-SIC); and singular value decomposition (SVD). Our optimization problem maximizes the system's capacity under peak amplitude, power consumption, and BER constraints. Simulation results have shown the superiority of a V-BLAST MMSE-SIC over the SVD architecture in terms of total spectral efficiency for a 4 × 4 MIMO short reach low driving voltage conventional SiP-based MZM system.

Original languageEnglish
Article number8114163
JournalIEEE Photonics Journal
Issue number1
StatePublished - 1 Feb 2018


  • Graded-index multi-mode fiber (GI-MMF)
  • data-centers
  • high performance computing (HPC)
  • mode group division multiplexing (MGDM)
  • multiple-input-multiple-output (MIMO)

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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